1. One of the _______ (志愿者)for the rescue work injured himself when helping others.
2. The thief has _______ (承认)that he stole the jewel.
3. He is a man who likes doing things _______ (有规律地).
4. Even though he is only a small boy，he has a sense of _________ (责任).
5. My letter received a ______ (迅速的)reply.
